SSR Val Rosay, Saint Didier au Mont d'Or, France.
J Voice. 2023 Mar;37(2):292.e9-292.e14. doi: 10.1016/j.jvoice.2020.11.029. Epub 2020 Dec 23.
To document the case of a high transmission rate of SARS-CoV-2 generating a cluster linked to an indoor choir rehearsal hold at the beginning of the COVID-19 pandemic in France.
Case study. Data were obtained via a questionnaire.
Twenty-seven participants, including 25 singers, 1 conductor and 1 accompanist attended a choir practice on March 12, 2020. The practice was indoor and took place in a non ventilated space of 45 m. No choir member reported having been symptomatic for COVID-19 between March 2 and March 12.The mean age of the participants was 66.9 (range 35-86) years. The secondary attack rate was 70%: 19/27 participants were diagnosed with COVID-19 from 1 to 12 days after the rehearsal with a median of 5.1 days. Thirty-six percent of the cases needed a hospitalization (7/19), and 21% (4/19) were admitted to an ICU. The index cases were asymptomatic and possibly multiple.
In the absence of valid barrier measures to prevent COVID-19 transmission, indoor choir practice should be suspended during the SARSCoV-2 surging phases. Transmission of the virus among gatherings from asymptomatic cases is a crucial issue and a main challenge to COVID-19 control.
记录 SARS-CoV-2 高传播率引发的集群病例，该集群与 COVID-19 大流行初期法国的室内合唱团排练有关。
病例研究。数据通过问卷调查获得。
2020 年 3 月 12 日，共有 27 名参与者参加了一场合唱团练习，包括 25 名歌手、1 名指挥和 1 名伴奏者。练习在室内进行，发生在一个 45 平方米的非通风空间内。没有合唱团成员报告在 3 月 2 日至 3 月 12 日之间出现 COVID-19 症状。参与者的平均年龄为 66.9 岁（范围 35-86 岁）。继发感染率为 70%：27 名参与者中有 19 名在排练后 1 至 12 天内被诊断出 COVID-19，中位数为 5.1 天。36%的病例需要住院治疗（7/19），21%（4/19）需要入住 ICU。最初的病例无症状且可能是多个。
在没有有效措施阻止 COVID-19 传播的情况下，应在 SARS-CoV-2 传播期间暂停室内合唱团练习。无症状病例在聚集人群中传播病毒是一个关键问题，也是 COVID-19 控制的主要挑战。
